Epithelium of the penis consists of the shaft skin, the foreskin, and the preputial mucosa on the inside of the foreskin and covering the glans penis. The epithelium is not attached to the underlying shaft so it is free to glide to and fro. [5] Ruth Bell, Changing Bodies, Changing Lives: Expanded Third Edition: A Book for Teens on Sex and Relationships, ISBN 0307794067, p. 15

Some penises are completely straight when erect. However, many have a bend or curvature. There are three main types of curved penis. These include penises that: Center of Disease Control. "DES Update: Consumers". Archived from the original on 2014-03-17 . Retrieved 2013-11-07. Schirren, C.; Rehacek, M.; Cooman, S. de; Widmann, H.-U. (24 April 2009). "Die retrograde Ejakulation". Andrologia. 5 (1): 7–14. doi: 10.1111/j.1439-0272.1973.tb00878.x. S2CID 83926005. The human penis is longer than in other primates except for the chimpanzee. The chimpanzee's penis is about the same length. The penis is bigger in circumference on humans than on other primates. [12] Circumcision [ change | change source ] Circumcision comparison, before (left) and after (right)

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Penis panic ( koro in Malaysian/ Indonesian) — delusion of shrinkage of the penis and retraction into the body. This appears to be culturally conditioned and largely limited to Ghana, Sudan, China, Japan, Southeast Asia, and West Africa.

Research has shown that males produce larger ejaculates containing better, more motile sperm when mating with a higher quality female. [45] This is largely to reduce a male's sperm competition, since more attractive females are likely to be approached and subsequently inseminated by more males than are less attractive females. Increasing investment in females with high quality phenotypic traits therefore acts to offset the ejaculate investment of others. [50] In addition, female attractiveness has been shown to be an indicator of reproductive quality, with greater value in higher quality females. [51] It is therefore beneficial for males to increase their ejaculate size and quality when mating with more attractive females, since this is likely to maximise their reproductive success also. Through assessing a female's phenotypic quality, males can judge whether or not to invest (or invest more) in a particular female, which will influence their subsequent ejaculate adjustment. Priapism is a painful and potentially harmful medical condition in which the erect penis does not return to its flaccid state. Priapism lasting over four hours is a medical emergency. The causative mechanisms are poorly understood but involve complex neurological and vascular factors. Potential complications include ischaemia, thrombosis, and impotence. In serious cases the condition may result in gangrene, which may result in amputation. However, that is usually only the case if the organ is broke out and injured because of it. The condition has been associated with a variety of drugs including prostaglandin. Contrary to common knowledge, sildenafil (Viagra) will not cause it. [57] The human penis differs from those of most other mammals, as it has no baculum (or erectile bone) and instead relies entirely on engorgement with blood to reach its erect state. A distal ligament buttresses the glans penis and plays an integral role to the penile fibroskeleton, and the structure is called "os analog", a term coined by Geng Long Hsu in the Encyclopedia of Reproduction. [10] It is a remnant of baculum evolved likely due to change in mating practice . [11] If you’re able to get erections, by all means do. Masturbate, have sex with a partner, or do anything else that gets you hard — whether you climax or not. Sex dreams and morning wood count. Keeping your body and mind healthy matters, too

What are the external parts?

Hard flaccid syndrome is a chronic and painful condition characterized by a semi-rigid penis in the flaccid state, a soft glans when erect, along with various associated symptoms like pelvic pain, low libido, erectile dysfunction, and penile sensory changes. Hakenberg OW, Compérat EM, Minhas S, Necchi A, Protzel C, Watkin N (January 2015). "EAU guidelines on penile cancer: 2014 update". Eur Urol (Practice guideline). 67 (1): 142–150. doi: 10.1016/j.eururo.2014.10.017. PMID 25457021. A person with a penis is born with a retractable layer of skin that covers the penile head, commonly referred to as the foreskin.

The hammer penis, which is long and thin with a much larger head, has all the makings for a good nailing. Wink. Like the penis, sperm competition has caused the human testicles to evolve in size through sexual selection. [35] This means that large testicles are an example of a sexually selected adaptation. The human testicles are moderately sized when compared to other animals such as gorillas and chimpanzees, placing somewhere midway. [41] Large testicles are advantageous in sperm competition due to their ability to produce a bigger ejaculation. [42] Research has shown that a positive correlation exists between the number of sperm ejaculated and testis size. [42] Larger testes have also been shown to predict higher sperm quality, including a larger number of motile sperm and higher sperm motility. [35] Main article: Erection The development of a penile erection, also showing the foreskin gradually retracting over the glans. See also: Commons image gallery. A ventral view of a penis flaccid (left) and erect (middle); a dorsal view of a penis erect (right) a b Veale, D.; Miles, S.; Bramley, S.; Muir, G.; Hodsoll, J. (2015). "Am I normal? A systematic review and construction of nomograms for flaccid and erect penis length and circumference in up to 15 521 men". BJU International. 115 (6): 978–986. doi: 10.1111/bju.13010. PMID 25487360. S2CID 36836535. Think you know it all when it comes to your penis? Here are some things you might not know, but should. Boners help keep your penis healthy

What are the internal parts?

Penile skin is often slightly darker than skin in surrounding areas. [23] This is due to a higher concentration of melanocytes in genital skin tissue. [24] The tip (glans) of the penis is usually pink or red color even if the penis shaft skin is dark. If the man is not circumcised, the tip is usually covered by the foreskin. The foreskin is about the same color as the skin on the shaft of the penis. Semen Analysis - Health Encyclopedia - University of Rochester Medical Center". www.urmc.rochester.edu . Retrieved 27 June 2023. One of the primary ways in which a male's ejaculate has evolved to overcome sperm competition is through the speed at which it travels. Ejaculates can travel up to 30–60 centimetres at a time [ quantify] which, when combined with its placement at the highest point of the vaginal tract, acts to increase a male's chances that an egg will be fertilised by his sperm (as opposed to a potential rival male's sperm), thus maximising his paternal certainty. [39] Montague, Peter. "PCBs Diminish Penis Size". Rachel's Hazardous Waste News. 372. Archived from the original on 2012-03-03.

Hadidi, Ahmed T. (2022). "Surgical Anatomy of the Penis and Urethra". Hypospadias Surgery: An Illustrated Textbook. Springer International Publishing: 105–126. doi: 10.1007/978-3-030-94248-9_4. ISBN 978-3-030-94247-2. "The darker color of penile skin is due to melanin secreted by a relatively Sebaceous prominences are raised bumps similar to Fordyce's spots on the shaft of the penis, located at the sebaceous glands and are normal. The human penis exits the abdomen above the scrotum and hangs freely outside the body. The main visible part is called the shaft.

Thomas A, Necchi A, Muneer A, Tobias-Machado M, Tran AT, etal. (February 2021). "Penile cancer". Nat Rev Dis Primers (Review). 7 (1): 11. doi: 10.1038/s41572-021-00246-5. PMID 33574340. S2CID 231877615.